785
FNCA52 TJSJ 070730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST FRI AUG 7 2026
DISCUSSION
ONCE AGAIN, ELEVATED FIRE WEATHER CONDITIONS FOR TODAY ACROSS THE
SOUTHERN AND SOUTHWESTERN PUERTO RICO, WHERE CRITICALLY DRY
FUELS, LOW RELATIVE HUMIDITY, AND BREEZY EASTERLY WINDS CONTINUE
TO SUPPORT AN INCREASED RISK FOR WILDFIRE IGNITION AND SPREAD.
RELATIVE HUMIDITY VALUES ARE EXPECTED TO FALLEN INTO THE UPPER
40S TO LOWER 50S ACROSS PORTIONS WITH SUSTAINED WINDS AROUND
15 TO 20 MPH, WITH HIGHER GUSTS. ALTHOUGH ISOLATED SHOWERS REMAIN
POSSIBLE ACROSS THE INTERIOR AND WESTERN SECTIONS OF PUERTO RICO
THROUGH LATE AFTERNOON, RAINFALL COVERAGE AND AMOUNTS ARE
EXPECTED TO BE INSUFFICIENT TO PROVIDE MEANINGFUL RELIEF OVER THE
SOUTHERN COASTAL PLAINS, WHERE FUELS REMAIN CRITICALLY DRY.
A DRIER AND MORE STABLE WEATHER PATTERN WILL ESTABLISHED THROUGH
THE WEEKEND AS MID-LEVEL RIDGING STRENGTHENS AND MOISTURE
DECREASES. EASTERLY TRADE WINDS WILL REMAIN BREEZY EACH DAY,
WHILE AFTERNOON MINIMUM RELATIVE HUMIDITY VALUES ARE EXPECTED TO
TREND LOWER, PARTICULARLY ACROSS SOUTHERN PUERTO RICO AND THE
U.S. VIRGIN ISLANDS. COMBINED WITH ONGOING RAINFALL DEFICITS AND
CRITICALLY DRY FINE FUELS, THESE CONDITIONS WILL SUPPORT AN
ELEVATED TO LOCALLY CRITICAL FIRE WEATHER THREAT EACH AFTERNOON,
ESPECIALLY ACROSS THE SOUTHERN AND SOUTHWESTERN COASTAL PLAINS OF
PUERTO RICO. RESIDENTS AND VISITORS SHOULD CONTINUE TO AVOID
OUTDOOR BURNING AND EXERCISE CAUTION WITH ACTIVITIES CAPABLE OF
PRODUCING SPARKS OR OPEN FLAMES, AS FAVORABLE CONDITIONS FOR
WILDFIRE IGNITION AND RAPID SPREAD ARE EXPECTED TO PERSIST
THROUGH THE WEEKEND.
PRZ014-072000-
SOUTHEAST COASTAL PLAINS-
330 AM AST FRI AUG 7 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 20
TEMP (24H TREND) 92 (+2) 74 (-2) 92
RH % (24H TREND) 47 (-5) 88 (+2) 48
WIND 20FT/EARLY(MPH) E 16 E 16 E 16
WIND 20FT/LATE(MPH) E 20 NE 12 E 18
MIXING HGT(FT-AGL/MSL)5800 5480
TRANSPORT WND (MPH) E 16 E 17
VENT RATE (KT-FT) 81200 82200
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-072000-
SOUTHERN HILLS-
330 AM AST FRI AUG 7 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 10 20
TEMP (24H TREND) 89 (+4) 70 (-4) 90
RH % (24H TREND) 55 (-9) 96 (+6) 52
WIND 20FT/EARLY(MPH) E 13 E 13 E 13
WIND 20FT/LATE(MPH) E 14 NE 12 E 13
MIXING HGT(FT-AGL/MSL)6300 6210
TRANSPORT WND (MPH) E 14 E 16
VENT RATE (KT-FT) 75600 86940
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-072000-
NORTH COASTAL PLAINS-
330 AM AST FRI AUG 7 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 30
TEMP (24H TREND) 91 (+1) 74 (-2) 92
RH % (24H TREND) 59 (-5) 95 (+2) 57
WIND 20FT/EARLY(MPH) E 13 E 17 E 14
WIND 20FT/LATE(MPH) E 18 E 12 E 20
MIXING HGT(FT-AGL/MSL)5170 5000
TRANSPORT WND (MPH) E 17 E 17
VENT RATE (KT-FT) 77550 75000
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-072000-
NORTHERN HILLS-
330 AM AST FRI AUG 7 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 10 40
TEMP (24H TREND) 89 (+1) 71 (-2) 90
RH % (24H TREND) 62 (-4) 98 (+4) 58
WIND 20FT/EARLY(MPH) E 12 E 16 E 13
WIND 20FT/LATE(MPH) NE 16 E 10 NE 18
MIXING HGT(FT-AGL/MSL)5660 5800
TRANSPORT WND (MPH) E 14 E 14
VENT RATE (KT-FT) 67920 69600
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-072000-
WEST COAST-
330 AM AST FRI AUG 7 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 30 50
TEMP (24H TREND) 92 (+1) 72 (-2) 92
RH % (24H TREND) 58 (-6) 97 (+3) 57
WIND 20FT/EARLY(MPH) E 11 E 16 E 12
WIND 20FT/LATE(MPH) SE 12 E 13 E 14
MIXING HGT(FT-AGL/MSL)5280 5010
TRANSPORT WND (MPH) E 8 E 10
VENT RATE (KT-FT) 36960 45090
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-072000-
EASTERN INTERIOR-
330 AM AST FRI AUG 7 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 30 40
TEMP (24H TREND) 90 (+2) 72 (-3) 91
RH % (24H TREND) 56 (-5) 97 (+6) 55
WIND 20FT/EARLY(MPH) E 13 E 13 E 12
WIND 20FT/LATE(MPH) E 13 E 14 E 13
MIXING HGT(FT-AGL/MSL)6450 6350
TRANSPORT WND (MPH) E 15 E 17
VENT RATE (KT-FT) 83850 95250
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-072000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST FRI AUG 7 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 30 40
TEMP (24H TREND) 85 (+4) 70 (-4) 87
RH % (24H TREND) 63 (-10) 99 (+6) 62
WIND 20FT/EARLY(MPH) E 11 E 11 E 11
WIND 20FT/LATE(MPH) E 11 E 11 E 12
MIXING HGT(FT-AGL/MSL)5110 4090
TRANSPORT WND (MPH) E 16 E 17
VENT RATE (KT-FT) 71540 61350
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-072000-
CENTRAL MOUNTAIN RANGE-
330 AM AST FRI AUG 7 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 30 40
TEMP (24H TREND) 87 (+5) 68 (-3) 88
RH % (24H TREND) 63 (-10) 99 (+5) 57
WIND 20FT/EARLY(MPH) E 9 E 12 E 9
WIND 20FT/LATE(MPH) E 11 E 9 E 12
MIXING HGT(FT-AGL/MSL)6410 6900
TRANSPORT WND (MPH) E 10 E 12
VENT RATE (KT-FT) 57690 69000
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-072000-
CAYEY MOUNTAIN RANGE-
330 AM AST FRI AUG 7 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 40
TEMP (24H TREND) 86 (+3) 70 (-3) 87
RH % (24H TREND) 62 (-8) 99 (+4) 61
WIND 20FT/EARLY(MPH) E 12 E 11 E 12
WIND 20FT/LATE(MPH) E 12 E 10 E 12
MIXING HGT(FT-AGL/MSL)5830 5080
TRANSPORT WND (MPH) E 17 E 20
VENT RATE (KT-FT) 87450 86360
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-072000-
VIEQUES-
330 AM AST FRI AUG 7 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 30
TEMP (24H TREND) 90 (+1) 79 (0) 91
RH % (24H TREND) 56 (-4) 84 (-2) 57
WIND 20FT/EARLY(MPH) E 14 E 14 E 14
WIND 20FT/LATE(MPH) E 14 E 18 E 16
MIXING HGT(FT-AGL/MSL)3740 3530
TRANSPORT WND (MPH) E 17 E 18
VENT RATE (KT-FT) 56100 56480
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-072000-
CULEBRA-
330 AM AST FRI AUG 7 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 30 30
TEMP (24H TREND) 91 (+3) 79 (-1) 91
RH % (24H TREND) 60 (-6) 87 (-1) 61
WIND 20FT/EARLY(MPH) E 14 E 16 E 16
WIND 20FT/LATE(MPH) E 14 E 17 E 14
MIXING HGT(FT-AGL/MSL)3580 3460
TRANSPORT WND (MPH) E 18 E 21
VENT RATE (KT-FT) 57280 62280
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-072000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST FRI AUG 7 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 20 20
TEMP (24H TREND) 91 (+1) 74 (-1) 92
RH % (24H TREND) 49 (-7) 90 (+6) 48
WIND 20FT/EARLY(MPH) E 12 E 13 E 17
WIND 20FT/LATE(MPH) SE 18 E 13 SE 19
MIXING HGT(FT-AGL/MSL)6070 5030
TRANSPORT WND (MPH) E 12 E 17
VENT RATE (KT-FT) 60700 75450
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-072000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST FRI AUG 7 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 20
TEMP (24H TREND) 89 (+2) 78 (-1) 90
RH % (24H TREND) 60 (-5) 88 (+1) 61
WIND 20FT/EARLY(MPH) E 16 E 18 E 16
WIND 20FT/LATE(MPH) E 16 E 18 E 16
MIXING HGT(FT-AGL/MSL)4020 3450
TRANSPORT WND (MPH) E 20 E 21
VENT RATE (KT-FT) 68340 62100
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-072000-
ST CROIX-
330 AM AST FRI AUG 7 2026
TODAY TONIGHT SAT
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 20
TEMP (24H TREND) 89 (+1) 78 (-1) 90
RH % (24H TREND) 60 (-5) 85 (-3) 61
WIND 20FT/EARLY(MPH) E 14 E 16 E 16
WIND 20FT/LATE(MPH) E 14 E 17 E 16
MIXING HGT(FT-AGL/MSL)4840 4590
TRANSPORT WND (MPH) E 20 E 23
VENT RATE (KT-FT) 82280 91800
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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